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The Mophie Juice Pack Plus Protects and Powers Your iPhone 4

The fact that Apple locks its batteries into its devices isn't just a design decision; it's a statement. Apple products are made with some of the best batteries on the market.

Regardless of this fact, even the most conservative iPhone 4 user is going to have a day that pushes the limits of his or her phone's built-in 1420 mAh battery. The Juice Pack Plus from Mophie — the same company that launched an iPhone-based credit card processing system earlier this year — adds an additional 2000 mAh battery within its shell, bringing the total onboard power to 3420 mAh and extending iPhone 4 use times by a large margin.

The case adds an additional eight hours of talk time, seven hours of Internet browsing, 11 hours of video playback and 44 hours of audio playback. By doing double duty as both a case and a backup battery, the Mophie Juice Pack Plus is one iPhone 4 case that's actually worth its $100 price tag.

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